Purmort bradford



(No Model.)

P. BRADFORD.

TRANSOM LIFTER No. 393,611; "Patented Nov. 27, 1888.

UNITED STATES PATENT OFFICE.

PURMORT BRADFORD, OF NEAV HAVEN, CONNECTICUT, ASSIGNOR TO SARGENT 8s COMPANY, OF SAME PLACE.

TRANSOM-LIFTER.

SPECIFICATION forming part of Letters Patent No. 593,611, dated November 27, 1888.

Application filed October 29, 1888. Serial No. 289,371.

To aZZ whom it may concern.-

Be it known that I, PURMoR'r BRADFORD, of New Haven, in the county of New Haven and State of Connecticut, have invented a new Improvementin Transom-Lifters; and I do hereby declare the following, when taken in connection with accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in-

Figure 1, a front view of a portion of the rod, showing the locking device; Fig. 2, a side view of the same; Fig. 3, a vertical central section of the same; Fig. 4., a transverse section,cutting through the axis of the cam; Figs. 5 and 6, modifications.

This invention relates to an improvement in that class of transom-lifters in which a rod is arranged in vertical guides on the jamb of the door, in connection with a jointed arm on the transom, and so that by raising or lowering the rod the transom will be opened or closed, as the case may be.

It is necessary that there should be some device on the jamb by which therod may be firmly held when at its position of rest, and so that the transom may be practically locked in the closed or at any position to which itmay be set. It is to the device for locking the rod that my invention particularly relates.

The object is to combine with a guide for the rod asimple and cheap construction, and one in which the parts may be produced by casting and without mechanical manipulation, and yet be effective in its operation; and the invention consists in the construction, as hereinafter described, and particularly recited in the claims.

In illustrating the invention I show only a portion of the rod and the guide to which the fastening device is applied. The connection between the rod and the transom (not shown) may be any of the known devices.

A represents the Vertical adjusting-rod for the lifter. The guide is composed of two arms, B B, connected outside the rod by a longitudinal bar, C. The arms are each constructedwith a foot, D, inside the rod, turned to the right or left, through which a screw may be (No model.)

introduced to secure the'guide to thejamb.

Through each of the arms B B is an opening,

E, through which the red A passes, and so as to slide freely up and down, if permitted so to do.

Inside the bar C, and between it and the rod A, is a cam, F. This cam is circular in shape, and is constructed with a pivot, G,whieh rests in a corresponding seat, H, in the bar C, and sothat the said disk may rotate upon its axis in a plane parallel with the axis of the rod. The back or outside of this cam is constructed with inclined surfaces a a,which work against the inner surface of the bar C, and so that as the cam is rotated in one direction the inclined surfaces a will work against the inside of the bar 0 and tend to force the cam toward the rod, or, turned in the opposite direction, the inclined surfaces will permit the cam to recede from the rod.

Preferably between the cam and the rod a shoe, I, is introduced, which rests upon the rod, as seen in Figs. 3 and 4, the face of the shoe corresponding to the shape of the rod, and so as to rest thereon, the back of the shoe constructed with a recess, b, into which a central projection, d, from the cam rests, and so as to prevent the escape of the shoe, the central projection, cl, of the cam working on the shoe asa center or pivot, but without rotative effect upon the shoe. The shoe, however, may be omitted and the cam constructed to bear (lirectlyupon the red, as seen in Fig. 5. The edges of the cam project each side the bar C, as seen in Fig. 1, so as to afford a ready grasp for the thumb and finger to rotate the cam.

In operation, if it be desired to adjust the rod, the cam is turned to relieve the rod from its pressure, when the rod will be free to be raised or lowered, as may be required, and when the desired position is attained the cam is returned to bring its bearing again upon the rod. The friction between the cam and the rod and the bearing of the rod in the guide is sufiicient to practically lock the rod at any 5 position in which it may be set. This conthe cheapest possible character, is as easily manipulated as a common set-screw, and quite as effective in its work.

I have represented the guide as having the connecting-bar outside the rod and the cam also outside the red; but the connection may be upon the inside of the rod and the cam arranged accordingly, as seen in Fig. 6. I, however, prefer the firstdescribed construction.

I claim 1. I11 a transonilifter, the combination of the vertical rod, a guide adapted to be secured to the jamb and through which the rod runs, the guide forming a bar on one side of the rod, a cam arranged between the said bar and the rod upon an axis at substantially right angles to the axis of the red, the back of the cam constructed with one or more inclines adapted to bear upon the bar, substantially as described, and whereby, under a rotation of the cam, it will be forced toward or from the rod to lock or release the rod, as the case may be.

2. In a transonrlifter, the combination of the red, the guide composed of the bar 0 out' side the rod, and of the arms B B, extend ing to and adapted to be secured to the jainb, and through which arms the rod passes as hearings for the rod, a rotating cam, F, between the said rod and bar, the cam constructed with a pivot, G,restin g in a corresponding seat in the said bar, the back of the said cam constructed with one or more inclines, and so as to bear against the said bar to cause the said cam to move toward or from the said rod, according to the direction in which the cam is rotated, substantially as and for the purpose described.

3. In a transom'lifter, the combination of the rod A, the guide composed of the bar 0 with two arms, B B, extending therefrom and adapted to be secured to the jamb, the said rod working through corresponding openings in the said arms as bearings for the rod, the retating cam F, constructed with a pivot upon its back to rest in a corresponding seat in the said bar, and also constructed upon its back with one or more inclines to bear against the corresponding surfaces on the said bar, the face of the said cam constructed with a center, (1, and a shoe, I, between the said cam and red, the cam constructed with a recess upon its back corresponding to the central projection of said cam, substantially as and for the purpose described.

PUR-MORT BRADFORD.

Witnesses:

FRANK W. WILLoUoIIBY, \VM. S. COOKE. 

